Full of address or skillfully eloquent; showing adeptness in speaking or communicating (archaic or rare usage).
From 'address' (originally meaning skill or dexterity in Old French) + '-ful' (full of), representing an older meaning of address before it specialized to mean mailing address.
This is a beautiful forgotten word—'addressful' originally meant you had the skill and dexterity to handle situations smoothly, which is why we still call someone's tact and grace their 'address' in French or diplomatic contexts.
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